nav{
    border-top: 5px #7418a1 solid;
    background-color: yellow;
}
header .b{
    text-align: -webkit-center;
    margin-top: 40px;
}
#nav-a{
    display: none;
}
#nav-ul{
    display: block;
}
header .b a{
    text-align: center;
    font-size: 100px;
    font-family: Arial;
    font-weight: 500;
    color: #7418a1;
    width: 144px;
    line-height: 144px;
    display: block;
    border: 1px solid #6b15a1;
    border-radius: 20%;
    margin: auto;
    margin-bottom: 30px;
}
.yi{
    text-align: center;
    margin-top: 90px;
}
.yi p{
    font-weight: bold;
}
.yi img{
    margin-bottom: 20px;
}
.img-h{
    height: 150px;
}
main h4{
    padding-top: 117px;
    padding-bottom: 70px;
}
main .box{
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border:3px solid #ffffff;
    position: absolute;
    top: 100px;
    left: 50%;
    margin-left: -50px;
}
main .box img{
    border-radius: 50%;
}

.dibu{
    margin-top: 80px;
    border-top: 5px solid #6b15a1;
    border-bottom: 1px solid #cccccc;
    border-left: 1px solid #cccccc;
    border-right: 1px solid #cccccc;
}
.dibu .qi{
    text-align: right;
}
.foot{
    padding-top: 60px;
    padding-bottom: 40px;
}
.foot a{
    color: #6b15a1;
    margin-right: 15px;
}
.di{
    text-align: center;
}
@media (max-width: 800px) {
        #nav-a{
            display: block;
        }
        #nav-ul{
            display: none;
        }
        .dibu .qi{
            text-align: center;
        }
        nav span{
            width: 100%;
            text-align: center;
        }
}